cmd/cache.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * Cache support: switch on or off, get status
  10  */
  11 #include <common.h>
  12 #include <command.h>
  13 #include <linux/compiler.h>
  14
  15 static int parse_argv(const char *);
  16
  17 void __weak invalidate_icache_all(void)
  18 {
  19         /* please define arch specific invalidate_icache_all */
  20         puts("No arch specific invalidate_icache_all available!\n");
  21 }
  22
  23 static int do_icache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  24 {
  25         switch (argc) {
  26         case 2:                 /* on / off     */
  27                 switch (parse_argv(argv[1])) {
  28                 case 0:
  29                         icache_disable();
  30                         break;
  31                 case 1:
  32                         icache_enable();
  33                         break;
  34                 case 2:
  35                         invalidate_icache_all();
  36                         break;
  37                 }
  38                 break;
  39         case 1:                 /* get status */
  40                 printf("Instruction Cache is %s\n",
  41                         icache_status() ? "ON" : "OFF");
  42                 return 0;
  43         default:
  44                 return CMD_RET_USAGE;
  45         }
  46         return 0;
  47 }
  48
  49 void __weak flush_dcache_all(void)
  50 {
  51         puts("No arch specific flush_dcache_all available!\n");
  52         /* please define arch specific flush_dcache_all */
  53 }
  54
  55 static int do_dcache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  56 {
  57         switch (argc) {
  58         case 2:                 /* on / off */
  59                 switch (parse_argv(argv[1])) {
  60                 case 0:
  61                         dcache_disable();
  62                         break;
  63                 case 1:
  64                         dcache_enable();
  65                         break;
  66                 case 2:
  67                         flush_dcache_all();
  68                         break;
  69                 }
  70                 break;
  71         case 1:                 /* get status */
  72                 printf("Data (writethrough) Cache is %s\n",
  73                         dcache_status() ? "ON" : "OFF");
  74                 return 0;
  75         default:
  76                 return CMD_RET_USAGE;
  77         }
  78         return 0;
  79 }
  80
  81 static int parse_argv(const char *s)
  82 {
  83         if (strcmp(s, "flush") == 0)
  84                 return 2;
  85         else if (strcmp(s, "on") == 0)
  86                 return 1;
  87         else if (strcmp(s, "off") == 0)
  88                 return 0;
  89
  90         return -1;
  91 }
  92
  93
  94 U_BOOT_CMD(
  95         icache,   2,   1,     do_icache,
  96         "enable or disable instruction cache",
  97         "[on, off, flush]\n"
  98         "    - enable, disable, or flush instruction cache"
  99 );
 100
 101 U_BOOT_CMD(
 102         dcache,   2,   1,     do_dcache,
 103         "enable or disable data cache",
 104         "[on, off, flush]\n"
 105         "    - enable, disable, or flush data (writethrough) cache"
 106 );